Abrasive supporting member and method of producing same



ABRASIVE SUPPORTING MEMBER AND METHOD OF PRODUCING SAME Filed June 10, 1955 2 Sheets-Sheet l gwucm/ko o Kenn 271; h. Boa/@71 WCZWZKQM Mis QM K. H. BOWEN Feb. 25, 19360 ABRASIVE SUPPORTING MEMBER AND METHOD OF PRODUCING SAME Filed June 10, 1935 2 Sheets-Sheet 2 3m mm Patented Feb. 25, 1936 EATS RATEN'E' FREE Kenneth H. Bowen, Au

burn, N. X, assignor to Coiumbian Rope Company,

Auburn, N. Y., a

corporation of New York ,Application June 10, 1935, Serial No. 25,895 i Claims.

This invention relates to improvements in abrasive supporting members and method of making same.

In certain machines on the market at the pres- 5 7 ant time, commonly referred to as sanding machines, the abrasive material is supported on a revolving member, the arrangement being such that the abrasive surface can be renewed, thus permitting the supporting member proper being r used any number of times. In some types of maclune, the abrasive material is applied to the periphery of a supporting member adapted to be rotated at the desired speed, while in other instances, the abrasive, in sheet form, is removably secured against the side face of a revoluble, diskiike body, capable of flexing under lateral stresses. in the latter type of supporting member, means are also usually provided for preventing excessive or destructive flexing of the supporting member, but in all types, the supporting member proper is secured on a core which is adapted to be mounted on a shaft for imparting rotary motion to said member.

One object of the present invention is to provide a supporting member in which the core is provided with means for transmitting the rotary motion of the core to said supporting member proper.

Another object is to provide a disk-like support capable of flexing laterally, but in which means are provided on the core for resisting such flexing action.

A further object is to provide a device of this character wherein the supporting surface for the abrasive is formed by a body composed of a length r of fibrous elements arranged in superposed convolutions around the periphery of a core, with means projecting radially from the core into said fibrous body whereby driving strains will be transmitted from the core to said body and, in constructions where the abrasive is supported on the side of the fibrous body, lateral flexing of said body will be resisted.

A still further object is to provide an abrasive supporting member which can be produced at low cost and which will consist of a minimum number of parts as by providing the driving means on the core and simply winding a length of fibrous elements on said core whereby a body of superposed, radially arranged convolutions will be formed on said core with said driving means engaging the inner radial portion of the fibrous body.

With these and other objects in view, the invention consists in certain details of construction and combinations and arrangements of parts, all

C r fle is an edge view of the core shown in 5 ig. is a sectional view of the structure shown in Fig. 3, this view being taken at right angles to Fig. 3;

Fig. 7 is an edge view of a still further modification of the core and driving elements, the pad being indicated in dotted lines;

Fig. 8 is a modified form of driving elements;

Fig. 9 is a transverse section showing a modi-. fied pad construction with the core and driving elements used in the construction shown in Figs.

and 2;

Fig. 10 is a transverse sectional view illustrating a pad mounted on a driving shaft;

Fig. 11 is an edge view of a still further modification of the core and driving elements; and

Fig. 12 is a transverse section illustrating another form of core and driving elements incorporated in an abrading roll or wheel, as distinguished from a pad construction.

The pad or fibrous body portion of the support may be of varying construction, but is preferably formed up by winding a length of fibrous elements, coated with a suitable binder, in successive co'nvolutions on a core l9. Preferably, the fibrous elements are individual fibers. Such a fibrous body is indicated at l l. The formation of fiber supporting pads or bodies of this type is more fully described and claimed in applications, Serial Nos. 8,762 and 8,763, filed February 28, 1935.

As before mentioned, the core or center [0 is adapted to be mounted for rotary motion. The entire assembly of one form of pad or support is illustrated in Fig. 10. Here, the shaft I 2 is provided with a collar l3 and a. threaded extremity beyond said collar to receive a plate 14 which abuts against said collar. Core II], with the disk-like abrasive supporting body II, is secured to the plateby bolts l5 and a sheet of abrasive material it is held in position against one side face of the supporting body by a flanged sleeve ll threaded on the shaft. I body of the type illustrated in this figure, one or more backing plates 68 are provided at the opposite side of the body to prevent undue flexing of said body by strains imposed laterally thereon when the Working face of the device is pressed against the surface being operated upon. With such an assembly, it is desired that the driving force or" the shaft be transmitted from core ill to the disk-like body 8 l and in the present instance this is accomplished by driving means provided on the core itself and engaging the inner radial portion of body l l.. -For instance, in the construction of Figs. 1 and 2, the core is formed with a plurality of pins l9 projecting radially from its periphery into the mass of fibers.

' It might be mentioned at this point that the fibers, in being Wound on the core, are preferably brought together with a tongue and groove arrangement, as shown in Fig. 2, as'such a construction aids in preventing damage to body H by shearing action set up by lateral strains im posed thereon under working conditions. However, the interlock'thus formed is notessential and may be omitted, as shown in Fig. 3.

The pins ld may, or may'not, be formed integrally with the core. As illustrated in Fig. 3,

they may be formed on a metal band 28, secured cnthe periphery of the core. The pins 19 may also be made of any desired length. As shown inFig. 8; they may be short and struck up out of theband Edlitself On the other hand, comparatively long pins may be used as in Figs. 3 and 6. The longer pins are advantageous in that they reinforce fiber body ii against the lateral stresses previously mentioned. Intact, by making the pins of sufficient length and heavy enough, 7 they can be used in lieu of the backing plate it! in the complete assembly. -Also, the pins may be offset laterally from one another as shown in Fig. 7. p I

Where the tool is to be operated at comparatively low speeds so that the driving forces are not too great, the core iii may be simply provided with a serrated or knurled surface 2i, as shown in Fig. 11;

li'ig. 12 shows a core member for an abrading roll Whose peripheral surface is used as the working surface, usually having an abrasive substance appliedthereto, althou h it may be used in bufling or polishing operations. Here, the pins l9, more With a supporting or less in the form of radialiy projecting studs, Y

are cast integrally with the core.

'With any of the forms illustrated, the production anduse of the core I 0 and pad or roll'bodyl i is greatly simplified. .As toproduction, it' is only necessary to provide the desired form of driving means or elements on the core-and wind the fibers thereon. As to fuse, especially where the longer projections are used for lateral reinforcement of the pad, the tool can be more quickly assembled,

as the backing plates iBcan be omitted. Also,

as previouslystated, eachiorm provides a positive drivebetween the core and body ll.

What I claim is: 1 1. An abrasive supporting member comprising a core adapted to be mounted for rotary movelnent, a fibrous disk-like body extending radially from said core, saidbody being capable of flexing laterally, and laterally flexible driving means on said core fortransmitting rotary motion from said core to said body, said driving means 'ex tending radially into said body and yieldingly resisting lateral strains on'said body.

2. An abrasivesupporting'mernbercomprising' a core adapted to be mounted for rotary motion,-

a fibrous'la'terally flexible disk like body extending radially from said core, and, a plurality of laterally flexible pins extending radially from said core into said fibrous body:

3. An abrasive'supporting member comprising .a coreadaptedto be mounted for rotary motion,

a laterally flexible fibrous disk-like body projecting radially from the periphery of said core, a band extending around said core, and a plurality of laterally flexible, radial projections on said band extending into said fibrous body. a

4. An abrasive supporting. member comprising a core adapted to be mounted for rotary motion, a flexible; disk-like 'fibrousbody extending radially from'the periphery of said core, and a plurality of laterally flexiblev projections secured to said core and extending radially into said fibrous body, a portion of sa-id projections being ofiset laterally from the others.

5. An. abrasive supporting member comprising a core adapted to be mounted for rotary motion, a flexible disk-like fibrous body extending'radially from the periphery of said core, a band secured on' said core, and a plurality. of laterally flexible projections formed on said band and projecting radially into said fibrous body, a portion of said projections being offset laterally'from the others. r j

KENNETH H. BOWEN. 

